Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
  • B22D41/50—Pouring-nozzles
  • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

• the invention relates to a method for introducing gas into a pouring opening of a metallurgical container in order to prevent or reduce deposits or freezes in the pouring opening, and to a pouring sleeve for carrying out the method.
• the present invention is based on the object of improving gas inlets in such a way that the deposits or freezes mentioned in the pouring opening can be prevented in a simple manner over the required pouring time.
• the object is achieved in that the gas is preheated to at least 1000 degrees Celsius, preferably even above the liguidus temperature of the molten metal, before entering the pouring opening. This allows the pouring times or Extend temporary closing times for as long as you like without interrupting the pouring process
• the melt in the pouring opening during the pouring does not experience any noticeable cooling in the temperature range which promotes the depositing of the deposit, or even a sticking to the opening wall due to solidification of the melt.
• the melt can freeze in the pouring opening in the closed position by blowing in heated gas can be completely prevented by a closing plate in the pouring opening provided the gas temperature is above the melt liguidus temperature.
• an inert gas such as e.g. Argon, or a gas-solid mixture is used.
• the gas can be heated by means of an external heating device or by a pouring sleeve according to the invention, in which the cold gas is led over a certain length via a gas supply line into the upper sleeve area in contact with the molten metal and from there through a gas-permeable pouring opening surrounding insert is blown into the melt.
• the gas can be easily heated above the melting point of the melt and freezes as well as possible alumina deposits on the opening wall can be prevented over the entire required casting time.
• Heated gas can of course also be blown into the extended pouring opening in a corresponding manner by means of a pouring tube or a closure plate.
• FIG. 5 another variant of a pouring sleeve in longitudinal section
• Fig. 6 cross section of the pouring sleeve according to Fig. 5 along the line
• FIG. 7 fourth variant of a pouring sleeve in longitudinal section and FIG. 8 top view of the sleeve according to FIG. 7.
• FIG. 1 shows a container 10 containing molten metal in the pouring area, in which the pouring spout is formed by a refractory pouring sleeve 20, to which schematically illustrated refractory closing plates 15 and 17 of a sliding closure known per se are connected.
• the partially shown container 10 can be, for example, a molten steel pan or an intermediate distributor and essentially consists of a steel jacket 14 and a refractory inner lining 12, in which the pouring sleeve 20 is embedded.
• the pouring sleeve 20 made of refractory material has an annular gas-permeable insert 23, which surrounds the pouring opening 26 and is surrounded on the circumference by a metal capsule 25, an annular space 27 being provided in between, which ensures a uniform distribution of the gas flowing out from the gas supply line 21.
• the gas supply line 21 is led into the upper region of the pouring sleeve 20, there in a coil-like manner around the Poured opening 26 and then heated heated through the insert 23 into the melt to be poured.
• the gas supply line 21 ′ which is formed like a coil in the upper region of the pouring sleeve 20, is in a refractory attachment 22, which is to be made of very good heat-conducting material, for example electrographite, which is glued onto the sleeve. embedded. Due to the dwell time in this attachment 22, which is in contact with the molten metal and very quickly assumes the temperature of the melt, the gas also experiences a very rapid heating, which approximately corresponds to the melt temperature.
• the gas supply line 21 consists of a highly heat-resistant steel or a refractory ceramic tube.
• the gas heated in the pouring sleeve 20 is inserted through an additional line 21 ′′, which is only shown in broken lines in FIG. 1, into a gas-permeable insert embedded in the upper closure plate 15 and enclosing the pouring opening 26 16 out and blown into the pouring opening 26 from there.
• the melt can freeze in this opening successfully.
• the heated gas is introduced through a gas-permeable stopper 35 fastened in a slide plate 34 and in the closed position under the pouring opening 26.
• the gas is guided from a gas source G, not shown, via a heating device 30 and a heat-resistant gas supply line 31 into the plug 35, the latter having holes for the purpose of being effective Blowing.
• the inserts surrounding the pouring opening can also contain such bores.
• the method according to the invention can, depending on the application, also be used with a pouring tube 36 connected to the closure 33, the pouring opening 37 of which has an insert 38.
• the gas is heated in the heating device 30 and guided through a heat-resistant line 32 into this insert 38 and thus into the pouring opening.
• the heating device 30 is also only shown schematically and it can be a known instantaneous heater.
• the sliding closure 33 is arranged on the spout of the container 10 and consists essentially of three refractory plates 34, 39 and 41, the upper and lower plates 39 and 41 being fixed, while the middle plate 34 is guided to be longitudinally displaceable.
• a variant of a pouring sleeve 40 in the container 10 according to FIGS. 3 and 4 consists of a refractory body 42 and a porous insert 43 embedded therein.
• the porous insert 43 in turn encloses the pouring opening 26.
• the gas supply G takes place through the sleeve 40 molded-in slot line 44, which in turn is guided into the upper sleeve region.
• the line 44 comprises a first and a second annular slot 44 'around the pouring opening 26 and a slot 44' 'which leads into a free space 45 surrounding the insert 43.
• the gas can be heated to the required temperature.
• FIG. 5 and 6 show a pouring sleeve 50 embedded in the container 10 as a further variant of the invention.
• This sleeve 50 is a refractory concrete cast in a sheet metal casing 51.
• the gas supply G takes place via a line 52 cast into the sleeve, which in turn is guided in a coil-like manner in the upper part of the sleeve 50 around the pouring opening 26 and from there into a sheet-metal-coated porous insert 55 also poured into the sleeve.
• the residence time of the gas in the coils 52 'and 52''results in sufficient heating of the gas are not limited heating of the gas.
• the pouring sleeve 60 shown in FIGS. 7 and 8 consists of a fully porous refractory body 61 with a pouring opening 26 and a sheet metal jacket 62 surrounding the body 61. Between the body 61 and the sheet metal jacket 62, an annular space 63 is provided, into which the heated one Gas is introduced through a line 64 connected to a gas supply G.
• the gas supply line 64 has a loop 64 'which is in contact outside and around the sleeve 61 with the metal melt and therefore consists of a refractory ceramic tube.
• the invention can also be applied very well to non-ferrous metals, for example aluminum melts, in which the melt temperature is relatively low and the gas therefore does not have to be heated as much.
• the pouring sleeves described can also be perforated blocks known per se and mortared in steel casting ladles.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Furnace Charging Or Discharging (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Manufacture And Refinement Of Metals (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4287346

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (5)

Citations (6)

Family Cites Families (10)

• 1987
  • 1987-12-24 CH CH5065/87A patent/CH675088A5/de not_active IP Right Cessation
• 1988
  • 1988-01-16 DE DE3801164A patent/DE3801164C2/de not_active Expired - Fee Related
  • 1988-10-18 BR BR888807373A patent/BR8807373A/pt unknown
  • 1988-10-18 WO PCT/EP1988/000934 patent/WO1989005700A1/de active IP Right Grant
  • 1988-10-18 EP EP89900208A patent/EP0367800B1/de not_active Expired - Lifetime
  • 1988-10-18 JP JP1500318A patent/JPH02502707A/ja active Pending
  • 1988-10-18 KR KR1019890700798A patent/KR900700214A/ko not_active Application Discontinuation
  • 1988-10-18 US US07/350,472 patent/US5019159A/en not_active Expired - Fee Related
  • 1988-12-01 ZA ZA889032A patent/ZA889032B/xx unknown
  • 1988-12-13 ES ES8803772A patent/ES2012895A6/es not_active Expired - Fee Related

Patent Citations (6)

Also Published As

Similar Documents

Legal Events